A) sebaceous glands
B) hair follicles
C) capillary plexus
D) arrectorpili
Correct Answer: D
Solution :
In body reactions to such stimuli as extreme cold, heat, burning, fear the arrestor Pilli muscles contracts due to the effect of adrenaline hormone and sympathelic stimulation. Their contraction reduces the obliquity of hair follicles, causing resection of the hairs. It enhances the protective and insulating functions of the pelage.
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